Personal note, I only got to rank 1.

How effective is this deck if you don’t mind me asking. It seems too slow and Mostly just relies on getting young dragonhawk and some one mana cost spells

Big priest is extremely tough to beat. I can say that luck plays a huge factor, and even get a 50% win rate against is nothing short of a miracle. However six cards in this deck are effective against it to an extent: raptor hatchling, ironbeak owl, crackling razorclaw,hunters mark, bear shark and deathstalker rexxar. Ironbeak owl is perfect for silencing many pesky minions. Crackling razorclaw is especially good if you get both of them and already have a minion like raptor hatchling on the board in the first few turns. I won one of my game by raptor hatchling, razorclaw (+3 damage buff), and then razorclaw (wind fury buff)+ timber wolf. My opponent conceded rather quickly.
You want to avoid killing minions, while dealing as much damage as possible before turn five (mass hysteria), and then you just have to get lucky enough to finish them off. I’ve had approximately two or three games against big priest that if I could’ve used my hero power one more time, i would’ve won. A slightly great synergy I found is Timberwolf+ tundra rhino.
You mostly just gotta play aggressively, while actively guessing and presuming what cards your opponent has. But the longer you play, the less likely you are to win. After turn 7 or 8, if you haven’t won yet, deathstalker rexxar is your only chance. You gotta hope for charge minions mostly. For build a beast, aim for something high damage, healing, charge etc. to note, knuckles and dispatch kodo are particularly effective when combined with something else. You gotta be particularly careful what cards you mulligan at first, a slip up anywhere would just lead to a waste of time.

Sorry to be a bother, but I would like to bring attention to a revised midrange beast hunter that may shake up the current meta.
What I request is an evaluation of this deck; I would like to have your opinion on it.